US 11,903,174 B2
System, method, and program for controlling air conditioner output for rack pressure regulation
Nirmal Singh Rajput, Tokyo (JP); Yoshinori Miyamoto, Tokyo (JP); Hisato Sakuma, Tokyo (JP); and Minoru Yoshikawa, Tokyo (JP)
Assigned to NEC CORPORATION, Tokyo (JP)
Appl. No. 17/440,328
Filed by NEC Corporation, Tokyo (JP)
PCT Filed Mar. 18, 2019, PCT No. PCT/JP2019/011042
§ 371(c)(1), (2) Date Sep. 17, 2021,
PCT Pub. No. WO2020/188672, PCT Pub. Date Sep. 24, 2020.
Prior Publication US 2022/0151115 A1, May 12, 2022
Int. Cl. G05B 15/02 (2006.01); H05K 7/20 (2006.01); F24F 11/63 (2018.01)
CPC H05K 7/20836 (2013.01) [F24F 11/63 (2018.01); G05B 15/02 (2013.01); H05K 7/20745 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A system for controlling an air conditioner configured to supply cooling air to a plurality of racks that each house at least one computer module, the system comprising:
a plurality of sensors including a plurality of pressure sensors and a plurality of temperature sensors, each sensor positioned at an air inlet of a corresponding racks;
a processor; and
a memory storing instructions executable by the processor to:
receive pressure values from the pressure sensors and temperature values from the temperature sensors, and control an airflow rate of the cooling air supplied from the air conditioner based on the pressure values and the temperature values, by:
acquiring a current temperature value for each temperature sensor;
adjusting the airflow rate in such a manner that a maximum temperature value among the temperature values approaches a first value;
after adjusting the airflow rate, setting a target pressure value for each pressure sensor;
acquiring a current pressure value for each pressure sensor;
calculating a pressure drop value for each pressure sensor between the current pressure value and the target pressure value; and
adjusting the airflow rate based on a maximum pressure value among the plurality of the pressure drop values.